Okamoto Family Residence

Okamoto Family Residence: A Soy Sauce Brewer's Home in Kaizuka

The Okamoto Family Residence (岡本家住宅, Okamoto-ke Jūtaku) is the former home of a soy sauce brewing family in the Kaizuka Jinaimachi district of Kitamachi, Kaizuka City, Osaka Prefecture, and its five buildings, led by a main house thought to date back to the mid-18th century, were entered on the national register as Registered Tangible Cultural Properties on March 18, 2003.

The family traded under the shop name Karatsuya, and during the Edo period (1603 to 1868) each head of the house took the name Ichirobei. According to Kaizuka City, the Okamotos also served as machidoshiyori, one of the elders who ran the affairs of Kita-no-cho, the northern ward of the town.

The property fills a corner plot at the northern end of a street called Oshita-suji. The main house faces west onto that street, and behind it to the north runs a single line of buildings: three storehouses and a detached reception wing.

A Temple Town and the Karatsuya Business

Kaizuka grew up as a jinaimachi, a town organized around a temple of the Jodo Shinshu (True Pure Land) school of Buddhism. Its center was Gansenji, also called Kaizuka Gobo. Kaizuka City's historical timeline records that in 1610 the Bokuhan family, hereditary heads of Gansenji, became lords of the town. For the rest of the Edo period the temple town was governed separately from the surrounding villages, which belonged to the Kishiwada domain.

The Bokuhan administration worked from an office known as the Bokuhan Yakusho, which stood until 1871 on the site now occupied by Kaizuka City Kita Elementary School. A city publication explains that Oshita-suji, roughly "the street below," took its name from running beneath the terrace on which the temple and the office stood. The same article lists the Okamoto soy sauce brewery among the houses along the street that still keep their Edo-period character.

Sources disagree on when brewing ended at the Okamoto Family Residence. Kaizuka City says the business continued into the early Showa era (from 1926), while Osaka Bunkazai Navi, a heritage database run by the prefecture's association of architects together with owners of registered buildings, gives a closure in the late 1950s. Either way, the brewing sheds are gone, and none of the five registered buildings was a production space.

How the Okamoto Family Residence Is Laid Out

Everything at the Okamoto Family Residence starts from the main house on Oshita-suji. Along the north side of the plot, three Dozo-zukuri storehouses stand in a row from west to east: the New Storehouse by the street, the Middle Storehouse, and the North Storehouse at the far end. The North Storehouse connects on its east side to the Zashiki, a detached reception building in the northeast corner.

The Agency for Cultural Affairs dates the buildings as follows. The main house belongs to the mid-Edo period, and the reception rooms added at its rear carry a Munafuda ridge tag of 1841. The Middle Storehouse is also mid-Edo, with a local tradition placing it in the Kyoho era (1716 to 1736). The North Storehouse is late Edo. A ridge tag fixes the New Storehouse at 1857. The Zashiki is from the Meiji era (1868 to 1912).

According to the Agency, none of the three storehouses was used for brewing. They were family stores for tools and household goods. What survives at the Okamoto Family Residence is therefore the domestic side of a merchant house, added to piece by piece over roughly 150 years.

From the street, the main house and the New Storehouse read as one continuous frontage. The Middle Storehouse, the North Storehouse and the Zashiki continue eastward beyond it, so how much of them you see depends on where you stand. Each building has its own page with details of its construction.

Registration of the Okamoto Family Residence

All five buildings of the Okamoto Family Residence became Registered Tangible Cultural Properties (Structures) on March 18, 2003, with official notice published on April 8, 2003. They carry the consecutive registration numbers 27-0230 to 27-0234, and each was listed under the criterion of contributing to the historic landscape of the country.

The numbers on either side belong to other houses in Kitamachi: 27-0229 is the storehouse of the Risai Family Residence and 27-0235 is the main house of the Omeshi Family Residence, a sign that the old houses of the district were registered together on that day. The Agency's description of the Okamoto main house notes that its roof is laid in the same stepped style (綴葺) as the nearby Risai Family Residence.

Visiting the Okamoto Family Residence

The Okamoto Family Residence is privately owned, and neither Kaizuka City nor Osaka Bunkazai Navi lists any opening days. As of September 2026 no regular public opening could be confirmed. Visitors can view the exterior from Oshita-suji and other public streets, but the grounds are closed.

There is no official guidance on photography. Keep to pictures of the building exteriors from the street, and avoid photographing the residents or their doorways.

The nearest station is Kaizuka, served by the Nankai Main Line from Osaka's Namba and by the Mizuma Railway. The house lies about 550 meters north of the station in a straight line, an 8 to 10 minute walk. Head north into the old temple town, pass Gansenji, and continue toward Kita Elementary School. The street running north to south past the school gate is Oshita-suji; follow it to its northern end, and the Okamoto house is on the east side.

Kaizuka City publishes a walking route through the temple town that starts and ends at Kaizuka Station and takes in Gansenji, Oshita-suji and the site of the Bokuhan office. There is no visitor parking, so the train is the practical way to come.